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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "clientstatus.h"
#include <string.h>
#include <cmath>
ClientStatus::ClientStatus()
: _error(false),
_errorMsg(),
_skipCnt(0),
_failCnt(0),
_overtimeCnt(0),
_totalTime(0),
_realTime(0),
_requestCnt(0),
_timetableResolution(10),
_timetable(10240 * _timetableResolution, 0),
_higherCnt(0),
_minTime(0),
_maxTime(0),
_reuseCnt(0),
_zeroHitQueries(0),
_requestStatusDistribution()
{
}
ClientStatus::~ClientStatus()
{
}
void
ClientStatus::SetError(const char *errorMsg)
{
_error = true;
_errorMsg = errorMsg;
}
void
ClientStatus::ResponseTime(double ms)
{
if (ms < 0) return; // should never happen.
if (ms > _maxTime)
_maxTime = ms;
if (ms < _minTime || _requestCnt == 0)
_minTime = ms;
_totalTime += ms;
size_t t = (size_t)(ms * _timetableResolution + 0.5);
if (t >= _timetable.size())
_higherCnt++;
else
_timetable[t]++;
_requestCnt++;
}
void
ClientStatus::AddRequestStatus(uint32_t status)
{
auto it = _requestStatusDistribution.find(status);
if (it != _requestStatusDistribution.end())
it->second++;
else
_requestStatusDistribution[status] = 1;
}
void
ClientStatus::Merge(const ClientStatus & status)
{
if (_timetable.size() != status._timetable.size()) {
printf("ClientStatus::Merge() : incompatible data structures!\n");
return;
}
if (_maxTime < status._maxTime)
_maxTime = status._maxTime;
if ((_requestCnt == 0) ||
(_minTime > status._minTime && status._requestCnt > 0))
_minTime = status._minTime;
_skipCnt += status._skipCnt;
_failCnt += status._failCnt;
_overtimeCnt += status._overtimeCnt;
_totalTime += status._totalTime;
_realTime += status._realTime;
_requestCnt += status._requestCnt;
for (size_t i = 0; i < _timetable.size(); i++)
_timetable[i] += status._timetable[i];
_higherCnt += status._higherCnt;
_reuseCnt += status._reuseCnt;
_zeroHitQueries += status._zeroHitQueries;
for (const auto& entry : status._requestStatusDistribution) {
auto it = _requestStatusDistribution.find(entry.first);
if (it != _requestStatusDistribution.end())
it->second += entry.second;
else
_requestStatusDistribution[entry.first] = entry.second;
}
}
double
ClientStatus::GetMin()
{
return _minTime;
}
double
ClientStatus::GetMax()
{
return _maxTime;
}
double
ClientStatus::GetAverage()
{
return (_requestCnt == 0) ?
0 : _totalTime / ((double)_requestCnt);
}
double
ClientStatus::GetPercentile(double percent)
{
if (percent < 0.0) percent = 0.0;
if (percent > 100.0) percent = 100.0;
double target = ((double)(_requestCnt - 1)) * (percent / 100.0);
long t1 = (long)std::floor(target);
long t2 = (long)std::ceil(target);
double k = std::ceil(target) - target;
int i1 = 0;
int i2 = 0;
long cnt = 0;
double val1 = 0;
double val2 = 0;
cnt = _timetable[0];
while (cnt <= t1) {
if (i1 + 1 < int(_timetable.size())) {
cnt += _timetable[++i1];
} else {
i1 = -1;
break;
}
}
i2 = i1;
if (i1 >= 0) {
val1 = i1;
while (cnt <= t2) {
if (i2 + 1 < int(_timetable.size())) {
cnt += _timetable[++i2];
} else {
i2 = -1;
break;
}
}
} else {
if (_higherCnt < 2) {
val1 = _maxTime * _timetableResolution;
} else {
// use uniform distribution for approximation
val1 = (((double)(t1 - (_requestCnt - _higherCnt))) / ((double)(_higherCnt - 1)))
* (_maxTime * _timetableResolution - ((double)_timetable.size())) + ((double)_timetable.size());
}
}
if (i2 >= 0) {
val2 = i2;
} else {
if (_higherCnt < 2) {
val2 = _maxTime * _timetableResolution;
} else {
// use uniform distribution for approximation
val2 = (((double)(t2 - (_requestCnt - _higherCnt))) / ((double)(_higherCnt - 1)))
* (_maxTime * _timetableResolution - ((double)_timetable.size())) + ((double)_timetable.size());
}
}
return (k * val1 + (1 - k) * val2) / _timetableResolution;
}
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